MongoDB User-Gruppe Düsseldorf

ctop – manage and monitor your Docker containers

In this post, I’d like to introduce you to a nice command line tool called ctop. I discovered it when I was looking for a tool to monitor some Docker containers for a MongoDB replica set on my local machine while running some load tests. ctop is basically...

• Container

17.12.2018 | 1 Minuten Lesezeit

Leaflet und GeoJSON-Daten

Heute zeige ich euch, wie man mittels der JavaScript-Bibliothek Leaflet GeoJSON -Daten auf einer Karte in eigenen Anwendungen darstellen kann. Wie man dies mittels des Google Maps JavaScript API macht, habe ich in diesem Beitrag erklärt . Wir werden ...

• Softwareentwicklung
• JavaScript

11.6.2018 | 3 Minuten Lesezeit

Google Cloud Function for Machine Learning

In this post I’ll show you how to use a Google Cloud Function to access the machine learning API for natural language processing . Cloud functions are one of the serverless features of the GCP. Please keep in mind that serverless does not mean that your...

• Cloud
• Google Cloud
• Machine Learning

21.5.2018 | 5 Minuten Lesezeit

Google Cloud Natural Language API

In this article I’d like to give you a short introduction to a subset of Google’s machine learning capabilities: the natural language API. This API processes text snippets and can apply several analysis algorithms: analyze-entities: detects entities ...

• Cloud
• Google Cloud
• Machine Learning

6.5.2018 | 4 Minuten Lesezeit

Google Maps API und GeoJSON-Daten

Heute zeige ich euch, wie man GeoJSON-Daten in eigenen Anwendungen in Zusammenhang mit Google Maps anzeigen kann. In meinem GeoJSON-Tutorial hatte ich kurz angesprochen, wie man GeoJSON-Daten mit Drittanbieter-Diensten darstellen kann. Zur Einbettung...

• Softwareentwicklung
• JavaScript
• Google

15.4.2018 | 3 Minuten Lesezeit

RESTful Microservices on the Google Cloud Platform

This tutorial shows you how to develop a RESTful microservice running on the Google Cloud Platform. I already explained how to deploy Spring Boot applications to the AppEngine and how to set up a MongoDB replica set in the Compute Engine . Today you...

• Cloud
• Google Cloud
• Microservices
• API
• Spring

8.4.2018 | 3 Minuten Lesezeit

GeoJSON Tutorial

In meinem Artikel über die Identifizierung potentieller EX-Raid Arenen in Pokémon GO habe ich das Thema GeoJSON nur kurz als Exkurs erwähnt. Heute möchte ich etwas detaillierter in dieses Thema einsteigen. GeoJSON Spezifikation Was genau sind denn überhaupt...

• Data
• Softwareentwicklung
• JavaScript

19.3.2018 | 4 Minuten Lesezeit

Cloud Launcher for MongoDB in the Google Compute Engine

In this post you will learn how to use Google’s Cloud Launcher to set up instances for a MongoDB replica set in the Google Compute Engine. Replication in MongoDB A minimal MongoDB replica set consists of two data bearing nodes and one so-called arbiter...

• Cloud
• Infrastructure as Code
• Google
• NoSQL

5.3.2018 | 3 Minuten Lesezeit

Deploying Spring Boot Applications in the Google AppEngine Flex Environment

In this tutorial I will show how to set up a deployment of Spring Boot applications for the AppEngine Flex environment in the Google Cloud infrastructure. Prerequisites You should be familiar with the Spring Boot ecosystem and should be able to use Maven...

• Software development
• Cloud
• Google
• Google Cloud
• Spring

13.2.2018 | 2 Minuten Lesezeit

EX-Raid-Arenen in Pokémon GO identifizieren

Heute betreiben wir ein wenig Data Mining mit Geo-Daten, um herauszufinden, wie man potentielle EX-Raid Arenen im Augmented Reality -Spiel Pokémon GO identifizieren kann. Pokémon GO Basics In Pokémon GO geht es darum, möglichst viele der kleinen Pokémon...

• Data
• JavaScript
• AR/VR

5.2.2018 | 5 Minuten Lesezeit

Change Streams in MongoDB 3.6

MongoDB 3.6 introduces an interesting API enhancement called change streams. With change streams you can watch for changes to certain collections by means of the driver API. This feature replaces all the custom oplog watcher implementations out there...

• Change Management
• NoSQL

15.1.2018 | 2 Minuten Lesezeit

Spring Cloud Service Discovery with Dynamic Metadata

Spring Cloud Service Discovery If you are running applications consisting of a lot of microservices depending on each other, you are probably using some kind of service registry. Spring Cloud offers a set of starters for interacting with the most common...

• Cloud
• Software architecture
• Spring

8.1.2018 | 2 Minuten Lesezeit

Lego WeDo 2.0 Programmierung

Den Lego WeDo 2.0 Bausatz habe ich in bereits in einem ersten Post vorgestellt . Im heutigen Beitrag möchte ich genauer auf dessen Programmierung eingehen. Meet Milo Zunächst muss aber erst mal Hardware her. Der Baukasten enthält (zum Glück, wie ich ...

• Softwareentwicklung
• Testing

18.10.2017 | 5 Minuten Lesezeit

JUnit 5 – Des Kaisers neue Kleider

JUnit 5 ist im September 2017 in der ersten stabilen Version erschienen. In diesem Post möchte ich Euch die wichtigsten neuen Features vorstellen. Dabei gehe ich davon aus, dass der geneigte Leser mit JUnit 4 halbwegs vertraut ist und Vergleiche dann...

• Java
• Testing

1.10.2017 | 7 Minuten Lesezeit

Unboxing Lego WeDo 2.0 Roboter Bausatz

In diesem und weiteren Posts möchte ich Euch das Lego WeDo 2.0 Set (45300) vorstellen. Es gehört zur Lego Education Linie und hat Kinder im Grundschulalter als Zielgruppe (und natürlich auch die zugehörigen AFOL s). Das Set wird in einem robusten stabelbaren...

• Softwareentwicklung
• Testing
• Künstliche Intelligenz

27.9.2017 | 2 Minuten Lesezeit

Graphen-Visualisierung mit Neo4j

In diesem Artikel möchte ich nach einer kurzen Einführung in die Graphen-Theorie einen Überblick über die NoSQL-Datenbank Neo4j geben. Insbesondere werde ich auf die Möglichkeiten eingehen, die Neo4j bei der Visualisierung von Graphen anbietet. Was ist...

• Datenbank
• NoSQL

18.6.2017 | 9 Minuten Lesezeit

In love with Ada

Anyone out there remembering the Ada programming language? In this blog post, I’m going to give you a short introduction to Ada, the history of its name and some of the current occurrences in pop culture. Hello World in Ada To compile our first Ada program...

• Software development
• Raspberry Pi

10.4.2016 | 3 Minuten Lesezeit

Joins and Schema Validation in MongoDB 3.2

Version 3.2 of the NoSQL database MongoDB introduces two new interesting features (amongst others) that I’d like to explore in this blog post. Joins The logical namespaces where documents are stored are called collections in MongoDB. Up to now every...

• NoSQL
• Big Data
• Validation

7.12.2015 | 3 Minuten Lesezeit

MongoDB-Einführung bei der Java-Usergruppe ruhrjug

Die Java-Enthusiasten im Ruhrgebiet treffen sich regelmäßig bei der ruhrjug , um sich über aktuelle Themen rund um die Programmiersprache Java auszutauschen. Beim letzten Treffen vor der Sommerpause am 25.06.2015 war ich eingeladen, um dort einen Vortrag...

• Java
• NoSQL
• Community
• Spring

1.7.2015 | 1 Minuten Lesezeit

MongoDB 2.8 – Neue Storage-Engine WiredTiger

Mit Version 2.8 kommen wesentliche Neuerungen auf die Benutzer der NoSQL-Datenbank MongoDB zu. Eine davon ist die Einführung einer weiteren Storage Engine. Was es damit auf sich hat, werde ich in diesem Artikel erläutern. Bis zur Version 2.6 hat MongoDB...

• Big Data
• NoSQL

10.12.2014 | 4 Minuten Lesezeit

MongoDB – Riesige Datenmengen schemafrei verwalten

MongoDB ist eine dokumentenorientierte NoSQL-Datenbank, die sich steigender Beliebtheit erfreut. In meinem Artikel MongoDB – Riesige Datenmengen schemafrei verwalten aus dem Java Magazin 5.14 gebe ich eine allgemeine kurze Einführung und erläutere die...

• Datenbank
• NoSQL

10.7.2014 | 1 Minuten Lesezeit

MongoDB World 2014

For the very first time, the MongoDB community from all over the world gathered in one place. The MongoDB World conference 2014 took place in New York City from June 23rd to 25th. Talks The talks were separated into three topics: dev, ops & buisness...

• Big Data
• NoSQL
• Community

6.7.2014 | 2 Minuten Lesezeit

Test Automation for NoSQL Databases with NoSQL Unit and Travis-CI

Today I want to give you a short summary of my NoSQL matters talk on test automation for NoSQL databases . I basically introduce two tools that may help you with writing unit and integration tests for NoSQL databases: NoSQLUNit is a JUnit extension...

• NoSQL
• Testing
• CI/CD

7.5.2014 | 1 Minuten Lesezeit

Near-Realtime Analytics with MongoDB, Node.js & SmoothieCharts

In this blog post we’ll have a look at how easy it is to do some (near-)realtime analytics with your (big) data. I will use some well-known technologies like MongoDB and node.js and a lesser known JavaScript library called Smoothies Charts for realtime...

• Big Data
• Node.js

21.1.2014 | 4 Minuten Lesezeit

MongoDB and Ruby

#MongoDB #Ruby I gave a lightning talk on the Ruby driver for MongoDB at the Cloud Developer Camp in Düsseldorf on last Saturday. Here are the slides: Click on the button to load the content from www.slideshare.net. Load content

• NoSQL
• Ruby

18.7.2013 | 1 Minuten Lesezeit

MongoDB 2.4 Introduces Geospatial Indexing and Search for GeoJSON Geometries...

In case you are unfamiliar with the geospatial stuff, have a look at this introduction to geospatial indexing and searching with MongoDB . In version 2.4 MongoDB introduces support for a subset of GeoJSON geometries. These geometries can be used both...

• JavaScript
• Big Data
• NoSQL

6.3.2013 | 3 Minuten Lesezeit

OOP 2013: Praktische Einführung in MongoDB

Auf der OOP 2013 gab es von mir einen Vortrag zum Thema „Praktische Einführung in MongoDB“ Klicken Sie auf den unteren Button, um den Inhalt von de.slideshare.net zu laden. Inhalt laden Wer wollte, konnte sich MongoDB herunterladen und die Beispiele...

• NoSQL
• Community

1.2.2013 | 1 Minuten Lesezeit

MongoDB Text Search Tutorial

In my introduction to text search in MongoDB , we had a look at the basic features. Today we’ll have a closer look at the details. API You may have noticed that a text search is not executed with a find() command. Instead you call db.foo.runCommand( ...

• NoSQL
• Search

10.1.2013 | 7 Minuten Lesezeit

MongoDB Text Search Explained

The upcoming release 2.4 of MongoDB will include a first, experimental support for full text search (FTS). This feature was requested early in the history of MongoDB as you can see from this JIRA ticket: SERVER-380 . FTS is first available with the ...

• NoSQL
• Search
• NLP

7.1.2013 | 5 Minuten Lesezeit

Spring Batch and MongoDB

#springbatch #mongodb #nosql Spring Batch Spring Batch is a Spring-based framework for enterprise Java batch processing. An important aspect of Spring Batch is the separation between reading from and writing to resources and the processing of a single...

30.11.2012 | 5 Minuten Lesezeit

Oliver Gierke on Spring Data and all the REST …

Today something completely different: I’ll interview Oliver Gierke from SpringSource . He we go … Tobias Trelle: Hi Oliver. Would you mind introducing yourself to listeners that might not already know you. Oliver Gierke: My name is Oliver Gierke. I ...

• Data
• Java
• Community
• Database
• NoSQL
• Spring

20.11.2012 | 10 Minuten Lesezeit

Pessimistic Locking with MongoDB

In this article, I’m going to sketch a pattern for implementing pessimistic locking with MongoDB . MongoDB is a document-orientated NoSQL datastore that does not support locking itself. In some business processes it may be required that you have an ...

23.10.2012 | 3 Minuten Lesezeit

GridFS Support in Spring Data MongoDB

MongoDB MongoDB is a highly scalable, document oriented NoSQL datastore from 10gen. For more information have a look at the MongoDB homepage: http://www.mongodb.org . A short introduction to MongoDB can be found at this blog post . GridFS In MongoDB ...

• Cloud
• Java
• Infrastructure
• NoSQL
• Spring

26.7.2012 | 2 Minuten Lesezeit

MonjaDB – A MongoDB GUI Client Tool

MongoDB MongoDB is a highly scalable, document oriented NoSQL datastore from 10gen. For more information have a look at the MongoDB homepage: http://www.mongodb.org . A short introduction to MongoDB can be found at this blog post . MonjaDB MonjaDB is...

5.6.2012 | 1 Minuten Lesezeit

Spring Data – Part 6: Redis

Redis Redis [1] is a NoSQL [2] key/value datastore. Think of it as a big, very fast persistent hashmap. Redis offers a master/slave data replication [3] and also a built-in publish/subscribe messaging system [4]. It is implemented in C and can be built...

• Java
• Cloud
• NoSQL
• Spring

26.4.2012 | 4 Minuten Lesezeit

Spring Data – Part 4: Geospatial Queries with MongoDB

Introduction Every location-based service [1 ] has to solve the following problem: find all venues within a given distance from the current location of the user. Long before the advent of mobile devices, geographic information systems (GIS) [2 ] had ...

• Cloud
• NoSQL
• Spring

15.3.2012 | 6 Minuten Lesezeit

Spring Data – Part 5: Neo4j

Introduction Neo4j [1 ] is a high-performance NoSQL [2 ] datastore specialized in persisting graphs. A graph [3 ] is data structure consisting of finite sets of vertices and edges, where an edge is a connection between two vertices. Graphs are used to...

• Software architecture
• Java
• Cloud
• NoSQL
• Spring

27.2.2012 | 4 Minuten Lesezeit

Spring Data – Part 3: MongoDB

In this part of my blog series I’m going to show how easy it is to access a MongoDB datastore with Spring Data MongoDB. MongoDB MongoDB is a so called NoSQL datastore for document-oriented storage. A good place to start with MongoDB is the Developer...

• Cloud
• NoSQL
• Spring

1.2.2012 | 5 Minuten Lesezeit

Spring Data – Part 2: JPA

What happened before? Part 1: Spring Data Commons Part 2: Spring Data JPA After looking at the Spring Data Commons project in the first part of this blog series, today I’m going to introduce you to the sub project Spring Data JPA . JPA Being a part ...

• Java
• Software development
• Spring

21.1.2012 | 3 Minuten Lesezeit

Spring Data – Part 1: Commons

One goal of the Spring Data project is to provide a common API for accessing both NoSQL datastores and relational databases. Spring Data serves as an umbrella project which offers general solutions – like pagination in large result sets – and consists...

• Spring

21.12.2011 | 2 Minuten Lesezeit

Testing and Mocking of Static Methods in Java

Again and again I stumble upon the myth that static code is evil because it is hard to test and you can’t mock it. Architects and lead developers are telling that tale and the juniors are picking it up and repeating it: “Static code is evil. It is hard...

• BDD
• Java
• Testing
• Software development
• Test Driven Development

10.11.2011 | 4 Minuten Lesezeit

Cloud Computing Basics: the CAP Theorem

Almost unlimited scalability is an essential facet of cloud computing as it is offered by the Google App Engine or CloudFoundry. Insuring this feature leads to a trade-off with other nonfunctional aspects from enterprise computing like consistency. But...

• Database
• Cloud

28.8.2011 | 4 Minuten Lesezeit

Documenting Custom Robot Framework Keyword Libraries

Right now, I’m introducing the robot framework for automated web tests for one of our customers. Beside the basic robot framework, we are using the SeleniumLibrary and RIDE . This tool stack is going to be rolled out to all software development teams...

• Testing

14.8.2011 | 2 Minuten Lesezeit

Quo vadis VMware? vFabric vs. Cloud Foundry

Introduction We will start with an introdcution of VMware’s cloud solutions vFabric and Cloud Foundry. After that, the further evolution of these PaaS platforms will be discussed. vFabric VMware offers his PaaS cloud solution vFabric Cloud Application...

• Spring
• Cloud

6.6.2011 | 3 Minuten Lesezeit

AMQP Messaging mit RabbitMQ und Spring

RabbitMQ ist als Messaging-System Teil der vFabric Cloud Application Platform. Die Unterstützung des performanten Messaging Protokolls AMQP prädestiniert RabbitMQ für den Einsatz in Hochverfügbarkeitsszenarien. RabbitMQ ist ein Open-Source-Produkt ...

• Cloud
• Java
• Softwareentwicklung
• Messaging
• Spring

20.4.2011 | 4 Minuten Lesezeit

WebSphereMQ Integration using Mule ESB Community Edition

Mule ESB is an open source implementation of an enterprise service bus. In contrast to the free Community Edition, Mule’s commercial Enterprise Edition provides integration of WebSphereMQ servers out of the box. This article explains how to integrate...

• Software architecture
• Integration

11.3.2011 | 1 Minuten Lesezeit